The relatively few craters that we see within the lunar maria
A) were formed by impacts that occurred after those that formed most of the craters in the lunar highlands.
B) were formed by impacts that occurred before those that formed most of the craters in the lunar highlands.
C) were created by the same large impactor that led to the formation of the maria.
D) are sinkholes that formed when sections of the maria collapsed.
E) are volcanic in origin, rather than from impacts.
A
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You and your friend want to go to the top of the Eiffel Tower. Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking longer to do so
Compare the gravitational potential energy (U) of you and your friend, after you both reach the top. A) It is impossible to tell, since the times are unknown. B) It is impossible to tell, since the distances are unknown. C) Your friend's U is greater than your U, because she got to the top faster. D) Both of you have the same amount of potential energy. E) Your U is greater than your friend's U, because you traveled a greater distance in getting to the top.
A solid aluminum cube rests on a wooden table in a region where a uniform external electric field is directed straight upward. What can we say concerning the charge on the top surface of the cube?
A) The top surface is neutral. B) The top surface is charged negatively. C) The top surface is charged positively. D) The top surface's charge cannot be determined without further information.
In the operation of a steam-electric generating plant, the work output [from thermal energy to work] occurs
A) at the point where the fossil or other fuel is shipped into the plant area. B) in the condenser. C) at the point where the energy from the furnace is transferred into the boiler. D) at the point where the hot steam pushes against the turbine. E) in the electric generators.
The main reason for the large inefficiency of the automobile is
A) the kinetic principle. B) friction in the moving parts. C) the first law of thermodynamics. D) the second law of thermodynamics. E) unburned hydrocarbons.